How to create manufacturing calendar which can be used in manufacturing and GOP

Team,

When I assign plant with 5 days calendar, I am unable to see the plant in GOP while creating sourcing rule. Reason being, for collection of calendar, the calendar should be of length 7 days. After making the calendar as 7 days, I am able to create the sourcing rule successfully in GOP.

How can I create workday pattern with 5 days, ( Saturday and Sunday as off ) for manufacturing and make this work in order management module as well ?

Thanks,

Akancha